Package opennlp.tools.util.featuregen

Klasse WindowFeatureGenerator

java.lang.Object

opennlp.tools.util.featuregen.WindowFeatureGenerator

Alle implementierten Schnittstellen:

AdaptiveFeatureGenerator

public class WindowFeatureGenerator
extends Object
implements AdaptiveFeatureGenerator

Generates previous (left-sided) and next (right-sided) features for a given AdaptiveFeatureGenerator. The window size can be specified.

Features:

• Current token is always included unchanged,
• Previous tokens are prefixed with p distance,
• Next tokens are prefix with n distance.

Siehe auch:

• AdaptiveFeatureGenerator

Feldübersicht

Felder

Modifizierer und Typ	Feld	Beschreibung
static final String	NEXT_PREFIX
static final String	PREV_PREFIX

Konstruktorübersicht

Konstruktoren

Konstruktor	Beschreibung
WindowFeatureGenerator(int prevWindowSize, int nextWindowSize, AdaptiveFeatureGenerator... generators)	Initializes a WindowFeatureGenerator with the given parameters.
WindowFeatureGenerator(AdaptiveFeatureGenerator generator)	Initializes a WindowFeatureGenerator.
WindowFeatureGenerator(AdaptiveFeatureGenerator... generators)	Initializes a WindowFeatureGenerator.
WindowFeatureGenerator(AdaptiveFeatureGenerator generator, int prevWindowSize, int nextWindowSize)	Initializes a WindowFeatureGenerator with the given parameters.

Methodenübersicht

Modifizierer und Typ	Methode	Beschreibung
void	clearAdaptiveData()	Informs a feature generator that the context of the adaptive data (typically a document) is no longer valid.
void	createFeatures(List<String> features, String[] tokens, int index, String[] preds)	Adds the appropriate features for the token at the specified index with the specified array of previousOutcomes to the specified list of features.
String	toString()
void	updateAdaptiveData(String[] tokens, String[] outcomes)	Informs a feature generator that the specified tokens have been classified with the corresponding set of specified outcomes.

Von Klasse geerbte Methoden java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Felddetails

PREV_PREFIX

public static final String PREV_PREFIX

Siehe auch:

• Konstantenfeldwerte

NEXT_PREFIX

public static final String NEXT_PREFIX

Siehe auch:

• Konstantenfeldwerte

Konstruktordetails

WindowFeatureGenerator

public WindowFeatureGenerator(AdaptiveFeatureGenerator generator,
 int prevWindowSize,
 int nextWindowSize)

Initializes a WindowFeatureGenerator with the given parameters.

Parameter:

generator - The AdaptiveFeatureGenerator to apply to the window.

prevWindowSize - Size of the window to the left of the current token.

nextWindowSize - Size of the window to the right of the current token.

WindowFeatureGenerator

public WindowFeatureGenerator(int prevWindowSize,
 int nextWindowSize,
 AdaptiveFeatureGenerator... generators)

Initializes a WindowFeatureGenerator with the given parameters.

Parameter:

prevWindowSize - Size of the window to the left of the current token.

nextWindowSize - Size of the window to the right of the current token.

generators - One or more AdaptiveFeatureGenerator to apply to the window.

WindowFeatureGenerator

public WindowFeatureGenerator(AdaptiveFeatureGenerator generator)

Initializes a WindowFeatureGenerator. The previous and next window size is 5.

Parameter:

generator - The AdaptiveFeatureGenerator to apply to the window.

WindowFeatureGenerator

public WindowFeatureGenerator(AdaptiveFeatureGenerator... generators)

Initializes a WindowFeatureGenerator. The previous and next window size is 5.

Parameter:

generators - One or more AdaptiveFeatureGenerator to apply to the window.

Methodendetails

createFeatures

public void createFeatures(List<String> features,
 String[] tokens,
 int index,
 String[] preds)

Beschreibung aus Schnittstelle kopiert: AdaptiveFeatureGenerator

Adds the appropriate features for the token at the specified index with the specified array of previousOutcomes to the specified list of features.

Angegeben von:

createFeatures in Schnittstelle AdaptiveFeatureGenerator

Parameter:

features - The list of features to be added to.

tokens - The tokens of the sentence or other text unit being processed.

index - The index of the token which is currently being processed.

preds - The outcomes for the tokens prior to the specified index.

updateAdaptiveData

public void updateAdaptiveData(String[] tokens,
 String[] outcomes)

Beschreibung aus Schnittstelle kopiert: AdaptiveFeatureGenerator

Informs a feature generator that the specified tokens have been classified with the corresponding set of specified outcomes.

Angegeben von:

updateAdaptiveData in Schnittstelle AdaptiveFeatureGenerator

Parameter:

tokens - The tokens of the sentence or other text unit which has been processed.

outcomes - The outcomes associated with the specified tokens.

clearAdaptiveData

public void clearAdaptiveData()

Beschreibung aus Schnittstelle kopiert: AdaptiveFeatureGenerator

Informs a feature generator that the context of the adaptive data (typically a document) is no longer valid.

Angegeben von:

clearAdaptiveData in Schnittstelle AdaptiveFeatureGenerator

toString

public String toString()

Setzt außer Kraft:

toString in Klasse Object